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It is currently a class B drug, and is illegal to produce, supply or import, although campaigners want it to become class A in recognition of the harm it can cause.

The open letter, from Lincolnshire PCC Marc Jones and signed by 19 colleagues, says: "We are of one mind that the challenges faced by synthetic cannabinoid substances are an urgent public health issue that is growing in size and demand upon public services and currently disproportionately upon policing."

It adds: "Our concerns not only lie with the devastating effects Spice has on its users but also the wider negative impacts felt by their families, communities and emergency services.

"We acknowledge that much is needed to fully address the problems Spice presents within our communities and it is clear that this complex issue can only be addressed collaboratively.